I read it as "There's zero appetite [on the part of browser vendors] for introducing non-standard language runtimes into browsers these days". Anyway, WebAssem

I read it as "There's zero appetite [on the part of browser vendors] for introducing non-standard language runtimes into browsers these days". Anyway, WebAssembly [0][1] is coming through the pipeline with the goal of opening a common browser runtime to more languages. Instead of Mozilla incorporating a Python runtime into Firefox, a Python runtime will eventually be able to target WebAssembly. For Python specifically, the work in progess on builtin GC support should help a lot [2]. As for the donation to PyPy, Mozilla uses Python heavily in internal tooling so I imagine that's part of the motivation. [0] https://webassembly.github.io/ https://webassembly.github.io/ [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1188259 https://bugzilla.mozilla.org/show_bug.cgi?id=1188259 [2] https://github.com/WebAssembly/design/blob/master/GC.md https://github.com/WebAssembly/design/blob/master/GC.md